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[Serge Hallyn <1514690@xxxxxxxxxxxxxxxxxx>]

So the problem is indeed that the cgroups are deleted using the
cgroupfs, and fuse doesn't get that information.  The fuse kernel module
is caching the information for one second before re-querying userspace.

I've pushed a patch to lxcfs to drop the caching to a half second.  I'm
posting a patch to lxc-devel to sleep for half a second during reboot.
This reliably fixes the race in my tests.

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https://bugs.launchpad.net/bugs/1514690

Title:
  rebooting container with systemd >= 226 fails to create /lxc/adt-
  xenial/init.scope control group

Status in lxc package in Ubuntu:
  In Progress

Bug description:
  Even after fixing bug 1497420 rebooting containers with systemd >= 226
  (i. e. with supporting unified cgroups) does not work. Build a
  standard xenial container (using the ubuntu template; e. g. "adt-
  build-lxc ubuntu xenial"), start it:

    sudo lxc-start -n adt-xenial -F

  then log in and run "sudo reboot". It shuts down, but reboot fails
  with

  Rebooting.
  systemd 227 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)
  Detected virtualization lxc.
  Detected architecture x86-64.

  Welcome to Ubuntu 16.04!

  Set hostname to <adt-xenial.new>.
  Failed to install release agent, ignoring: No such file or directory
  Failed to create /lxc/adt-xenial/init.scope control group: No such file or directory
  Failed to allocate manager object: No such file or directory
  [!!!!!!] Failed to allocate manager object, freezing.
  Freezing execution.

  During that time, I get the following errors:

  Nov 09 08:42:31 donald cgmanager[864]: cgmanager: Invalid path /run/cgmanager/fs/none,name=systemd///lxc/adt-xenial/init.scope (No such file or directory)
  Nov 09 08:42:31 donald cgmanager[864]: cgmanager:list_children_main: Could not determine the requested cgroup (name=systemd:lxc/adt-xenial/init.scope)
  Nov 09 08:42:31 donald cgmanager[864]: cgmanager: Invalid path /run/cgmanager/fs/none,name=systemd///lxc/adt-xenial/init.scope (No such file or directory)
  Nov 09 08:42:31 donald cgmanager[864]: cgmanager:list_keys_main: Could not determine the requested cgroup (name=systemd:lxc/adt-xenial/init.scope)
  Nov 09 08:42:31 donald lxcfs[882]: ** (process:882): WARNING **: cgmanager method call org.linuxcontainers.cgmanager0_0.ListChildren failed: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: invalid request. Use G_DBUS_DEBUG=message for more info.
  Nov 09 08:42:31 donald lxcfs[882]: ** (process:882): WARNING **: cgmanager method call org.linuxcontainers.cgmanager0_0.ListKeys failed: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: invalid request. Use G_DBUS_DEBUG=message for more info.h

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: lxc 1.1.5-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Nov 10 06:30:28 2015
  EcryptfsInUse: Yes
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx
  lxc.conf: lxc.lxcpath = /srv/lxc

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